Questions Remain About Nazi-Looted Art Trove07:43

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This article is more than 6 years old.A painting from Henry Matisse "Sitzende Frau" ("Sitting Woman") is projected on a screen during a news conference in Augsburg, southern Germany, Tuesday, Nov. 5, 2013, on the art found in Munich. (Kerstin Joensson/AP)

German authorities are not saying where they're currently keeping 1,400 works of Nazi-looted art. A German magazine on Sunday reported the artwork was found in a filthy Munich apartment last year.

The recovery of works by Picasso, Matisse, Renoir and other artists is being called the most important discovery of Nazi-looted art since the end of World War II.

Police uncovered the artwork as part of a routine tax investigation that began with the arrest of a suspicious man on a train from Zurich to Munich in 2010. The man is believed to be Cornelius Gurlitt, the son of an art dealer who was one of a handful of dealers designated to sell what the Nazis called "degenerate" art during the war.

Owners of artwork stolen by the Nazis are demanding to see a full list of the works, to determine if police have found the art their families previously owned.